/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.db.mpp.plan.planner.plan.node.source;

import com.google.common.collect.ImmutableList;
import org.apache.iotdb.common.rpc.thrift.TRegionReplicaSet;
import org.apache.iotdb.commons.path.MeasurementPath;
import org.apache.iotdb.commons.path.PartialPath;
import org.apache.iotdb.commons.path.PathDeserializeUtil;
import org.apache.iotdb.db.mpp.common.header.ColumnHeaderConstant;
import org.apache.iotdb.db.mpp.plan.planner.plan.node.*;
import org.apache.iotdb.tsfile.read.filter.basic.Filter;

import java.io.DataOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.List;
import java.util.Objects;

public class LastQueryScanNode extends SeriesSourceNode {

    public static final List<String> LAST_QUERY_HEADER_COLUMNS =
            ImmutableList.of(
                    ColumnHeaderConstant.TIMESERIES,
                    ColumnHeaderConstant.VALUE,
                    ColumnHeaderConstant.DATATYPE);

    // The path of the target series which will be scanned.
    private final MeasurementPath seriesPath;

    // The id of DataRegion where the node will run
    private TRegionReplicaSet regionReplicaSet;

    public LastQueryScanNode(PlanNodeId id, MeasurementPath seriesPath) {
        super(id);
        this.seriesPath = seriesPath;
    }

    public LastQueryScanNode(
            PlanNodeId id, MeasurementPath seriesPath, TRegionReplicaSet regionReplicaSet) {
        super(id);
        this.seriesPath = seriesPath;
        this.regionReplicaSet = regionReplicaSet;
    }

    @Override
    public void open() throws Exception {
    }

    @Override
    public TRegionReplicaSet getRegionReplicaSet() {
        return regionReplicaSet;
    }

    @Override
    public void setRegionReplicaSet(TRegionReplicaSet regionReplicaSet) {
        this.regionReplicaSet = regionReplicaSet;
    }

    public MeasurementPath getSeriesPath() {
        return seriesPath;
    }

    @Override
    public void close() throws Exception {
    }

    @Override
    public List<PlanNode> getChildren() {
        return ImmutableList.of();
    }

    @Override
    public void addChild(PlanNode child) {
        throw new UnsupportedOperationException("no child is allowed for SeriesScanNode");
    }

    @Override
    public PlanNode clone() {
        return new LastQueryScanNode(getPlanNodeId(), seriesPath, regionReplicaSet);
    }

    @Override
    public int allowedChildCount() {
        return NO_CHILD_ALLOWED;
    }

    @Override
    public List<String> getOutputColumnNames() {
        return LAST_QUERY_HEADER_COLUMNS;
    }

    @Override
    public <R, C> R accept(PlanVisitor<R, C> visitor, C context) {
        return visitor.visitLastQueryScan(this, context);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        if (!super.equals(o)) return false;
        LastQueryScanNode that = (LastQueryScanNode) o;
        return Objects.equals(seriesPath, that.seriesPath)
                && Objects.equals(regionReplicaSet, that.regionReplicaSet);
    }

    @Override
    public int hashCode() {
        return Objects.hash(super.hashCode(), seriesPath, regionReplicaSet);
    }

    @Override
    public String toString() {
        return String.format(
                "LastQueryScanNode-%s:[SeriesPath: %s, DataRegion: %s]",
                this.getPlanNodeId(),
                this.getSeriesPath(),
                PlanNodeUtil.printRegionReplicaSet(getRegionReplicaSet()));
    }

    @Override
    protected void serializeAttributes(ByteBuffer byteBuffer) {
        PlanNodeType.LAST_QUERY_SCAN.serialize(byteBuffer);
        seriesPath.serialize(byteBuffer);
    }

    @Override
    protected void serializeAttributes(DataOutputStream stream) throws IOException {
        PlanNodeType.LAST_QUERY_SCAN.serialize(stream);
        seriesPath.serialize(stream);
    }

    public static LastQueryScanNode deserialize(ByteBuffer byteBuffer) {
        MeasurementPath partialPath = (MeasurementPath) PathDeserializeUtil.deserialize(byteBuffer);
        PlanNodeId planNodeId = PlanNodeId.deserialize(byteBuffer);
        return new LastQueryScanNode(planNodeId, partialPath);
    }

    @Override
    public PartialPath getPartitionPath() {
        return seriesPath;
    }

    @Override
    public Filter getPartitionTimeFilter() {
        return null;
    }
}
